The setup of The Poisoned Chocolates Case is rightly very famous: a lady is killed when a box of chocolates given to her husband by another member of his gentlemen’s club — who himself received them unsolicited through the mail — turns out to have been laced with poison. The police, with no culprit in sight, allow six amateurs with a fascination for real life crimes to theorise and present their own solutions, each one appearing watertight until someone finds a flaw that brings the edifice down. For this conceit alone, and the genius way Berkeley uses his different sleuths to unpick the sparse and simple known facts, this book has passed into near-legend in detective fiction circles.